Dissolved organic matter and nutrients in the Lena River, Siberian Arctic: Characteristics and distribution
Dissolved organic matter and nutrients in the Lena River, Siberian Arctic: Characteristics and distribution
复制标题
DOI：
10.1016/s0304-4203(97)00076-5
复制
发表时间：
1998
期刊：
影响因子：
3
通讯作者：
R. Lara;V. Rachold;G. Kattner;H. Hubberten;G. Guggenberger;A. Skoog;D. Thomas
中科院分区：
文献类型：
--
作者：
R. Lara;V. Rachold;G. Kattner;H. Hubberten;G. Guggenberger;A. Skoog;D. Thomas
溶解有机碳（DOC）和氮（DON），氨基酸，碳水化合物和无机营养盐于1994年7月在雅库茨克和Lena三角洲，东西伯利亚之间的18个站采取的样品进行了测量。除了在支流Aldan河和Vilyuy河测得的几个参数的浓度明显较高之外，沿河沿着没有明显的梯度或特征。DOC浓度在300 ~ 1000 μM C之间变化，大多数值在500 ~ 700 μM C之间变化（平均570 μM C）。DON浓度范围为9 - 28 μM N（平均13 μM N）。大量溶解有机质（DOM）的C/N比范围为30 ~ 58，其中75%的值在45 ~ 55之间（平均48）。总溶解氨基酸（TDAA）范围在1.6和5.4 μM之间，平均约3.5 μM，主要以结合形式存在，约占DON的28%。游离氨基酸仅占TDAA的2%左右。甘氨酸、天冬氨酸和谷氨酸占优势，约占TDAA的41%。总溶解碳水化合物的范围为190至470 μg葡萄糖当量l− 1，平均为299 μg l−1，仅占DOC库的1.2%至2.5%。测量了以下范围的无机营养素：硝酸盐，0.01至1.4 μM N（平均0.6 μM N）;亚硝酸盐，0.03 - 0.1 μM N（平均0.07 μM N）;铵，0.01至0.3 μM N（平均0.13 μM N）;磷酸盐，0.2至1 μM P（平均0.5 μM P）;硅酸盐，59至87 μM Si（平均66 μM Si）。悬浮有机物的碳同位素数据表明，低无机氮值不是由于藻类吸收，而是河流和集水区的固有特性。这一点，再加上硅酸盐，DOC和DON和高C/N值之间的正相关性，表明在勒拿河的DOM的组成主要是由土壤来源的，不含柠檬酸盐的材料，而不是由本地来源的输入。
Dissolved organic carbon (DOC) and nitrogen (DON), amino acids, carbohydrates and inorganic nutrients were measured on samples taken in July 1994 at 18 stations between Yakutsk and the Lena delta, East Siberia. There were no obvious gradients or features along the river, except in the tributaries, the Aldan and Vilyuy rivers, where significantly higher concentrations of several parameters were measured. Concentrations of DOC varied between 300 and 1000 μM C, with most values varying between 500 and 700 μM C (mean 570 μM C). DON concentrations ranged between 9 and 28 μM N (mean 13 μM N). The C/N ratios of bulk dissolved organic matter (DOM) varied from 30 to 58, with 75% of the values being between 45 and 55 (mean 48). Total dissolved amino acids (TDAA) ranged between 1.6 and 5.4 μM, averaged about 3.5 μM, mostly in the combined form, and represented about 28% of the DON. Free amino acids were only about 2% of TDAA. Glycine, aspartic acid and glutamic acid predominated, accounting for about 41% of TDAA. Total dissolved carbohydrates ranged from 190 to 470 μg glucose equivalents l−1and averaged 299 μg l−1, forming only 1.2 to 2.5% of the DOC pool. The following ranges of inorganic nutrients were measured: nitrate, 0.01 to 1.4 μM N (mean 0.6 μM N); nitrite, 0.03 to 0.1 μM N (mean 0.07 μM N); ammonium, 0.01 to 0.3 μM N (mean 0.13 μM N); phosphate, 0.2 to 1 μM P (mean 0.5 μM P); silicate, 59 to 87 μM Si (mean 66 μM Si). Carbon isotope data of the suspended organic material suggest that the low inorganic nitrogen values are not due to algal uptake, but rather an inherent characteristic of the river and the catchment area. This, together with positive correlations between silicate, DOC and DON and high C/N values, suggests that the composition of DOM in the Lena River is mainly determined by the input of soil-derived, recalcitrant material and not by autochthonous sources.